In the Application zone

We are working on a database of Oracle 10 g and I am confused with my current problem of the company. I openly tell my expierience works with applications with users across multiple time zones is limited. Here's my current frustration. On our database, which is managed by our Organization COMPUTER, when I try to use functions to change the time zone, I get 'UNKNOWN '. The offset is always given, but zone region is never displayed, it is still unknown. I know that the box I am currently working on is in the EAST, but I do not know if is observed DST? My application requires certain behavior at the beginning of each month. Our business plan says that our system will work always at the time of the East, but it can move to a database on the West Coast server later. So when I write code as select extract (TIMEZONE_REGION from CURRENT_TIMESTAMP) it is unknown. If I write "Select double sessiontimezone or dbtimezone double I get - 05:00, which shows me that it is in." I need to write a function which basically always takes the date system and always it shifts East Similarly if the box on which I am in PST. As I get the 'UNKNOWN' trying to get to the region, I can't use some built-in functions. I see that our data base does not recognize the EDT as a 'region', then how the DST is managed? I thought I could take any shift, always bring back the hour GMT, then move it to the East, it might work except the possible displacement of the DST?

Needless to say, my mind is essentially blown... and this has been a long day. Thanks for any help... Here my basic business rule:
No matter what the time zone is the db's, I still want to store data in IS observing DST... Sounds simple, that I don't know I'm missing something.

Thanks for your help guys!

Malibu368

If you want just the current timestamp in a particular time zone, use the clause to the ZONE. Since I am in the time zone of the East already, I will show and example of conversion of the present time in the Pacific time zone as well as the conversion to Eastern time zone (conversion to the East has obviously no effect).

SQL> ed
Wrote file afiedt.buf

  1  select systimestamp,
  2         systimestamp at time zone 'US/Pacific',
  3         systimestamp at time zone 'US/Eastern',
  4         sys_extract_utc( systimestamp )
  5*   from dual
SQL> /

SYSTIMESTAMP
---------------------------------------------------------------------------
SYSTIMESTAMPATTIMEZONE'US/PACIFIC'
---------------------------------------------------------------------------
SYSTIMESTAMPATTIMEZONE'US/EASTERN'
---------------------------------------------------------------------------
SYS_EXTRACT_UTC(SYSTIMESTAMP)
---------------------------------------------------------------------------
19-APR-11 10.34.52.250000 PM -04:00
19-APR-11 07.34.52.250000 PM US/PACIFIC
19-APR-11 10.34.52.250000 PM US/EASTERN
20-APR-11 02.34.52.250000 AM

Commonly, applications that need to store dates from around the world will want to store them using GMT (Greenwich Mean Time / coordinated universal time) and then convert to a local time zone. Oracle provides the SYS_EXTRACT_UTC function to convert timestamps in GMT. You can then use the NEW_TIME function to convert the date GMT in a local time zone. This is not necessary if you want to always just time in the Eastern time zone, but it may be useful to other places.

Justin

Tags: Database

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